Exhaust muffler



June 21, 1938. R. BARRON EXHAUST MUFFLER Filed April 16. 1957 llltlllllll IIIIIIIIIIIIIIIIIIIIIIIIIII .L

//V//[/V TOR R BR/'70N if@ Patented June 21, 1938 UNITED STATES PATENT oFFicE 4 Claims.

My invention relates to improvements in exhaust mufflers, and the object of the invention is to devise a muiller which will eliminate the objectionable noise carried in the exhaust and, at

` the same time, eliminate all back pressure of the engine, and it consists essentially of the arrangement and construction of parts all as hereinafter more particularly explained.

Fig. l is a perspective View of my muffler inter- -mediately broken away and a portion of the exhaust pipe to which it is connected.

Fig. 2 is a longitudinal sectional view through Fig. l.

Fig. 3 is a transverse sectional view.

Fig. 4 is a perspective fragmentary detail of the outer end of the exhaust pipe.

Fig. 5 is a perspective detail of a pair of defleeting discs separated apart and as used in the exhaust pipe.

Fig. 6 is a perspective detail of a pair of defleeting discs surrounding the exhaust pipe.

In the drawing like letters of reference indicate corresponding parts in the different views.

I is the exhaust pipe leading from the engine which is enlarged as indicated at Ix. The outer end of the enlarged portion of the exhaust portion IX is provided with radial lugs 2 between which lugs are located notched openings 3 through which the exhaust gases pass. 4 is an outer tube surrounding the enlarged portion of the exhaust pipe and spaced therefrom as indicated in Fig. 2 and provided at its outer end with an end head 5 provided centrally with an inwardly extending conical portion 6 and an end head 1 provided with a central opening 8 in which the inner end of the enlarged portion IX of the exhaust pipe ts.

IIJ are a series of openings spaced apart around the periphery of the tube 4 adjacent its inner end and from which extend a series of small pipes 9. The inner ends of the pipes 9 are curved to fit into the openings I8, the opposite or outer ends of the pipes being open and extending preferably slightly beyond the end head 5. Within each pipe 9 is fitted a metal strip II which is twisted into spiral form so that the gases passing therethrough are directed spirally and are also prevented from any tendency to direct return movement to increase back pressure.

I2 and I3 are a series of pairs of discs provided with central openings I4 and l5. The discs I2 and I3 are cut radially preferably in V form and the intervening tongues I6 and I1 are twisted in opposite directions to assume an inclined position. I8 and I9 are nuts which are screwed on to the threaded'poritons 2l and 22 of a central rod 28, which rod extends through the central openings I4 and I5 of the discs I2 and I3, the discs being spaced an equal distance upon the rod and separated apart by spacing sleeves 20X.

23 and 24 are discs provided with central openings through which the enlarged portion IX of the exhaustpipe fits tightly, the peripheral edge of each disc being provided with V notches 25 and 2B spaced equal distances apart leaving 10 tongues 21 and 28. The tongues 21 and 2B of each pair of discs 23 and 24 are twisted in opposite directions. The discs 23 and 24 fit around the enlarged portion Ix so as to fit the interspace between the exhaust pipe and the tube 4. 15

By means of the discs I2 and I3 and 23 and 24, the gases passing first through the exhaust pipe are given a Zig-zag direction by means of the inclined tongues I6 and I1 and after passing through the notched openings 3 into the inter- 20 space between the exhaust pipe and tube 4 are directed in the opposite direction past the discs 23 and 24, the inclined tongues 21 and 28 thereof also imparting a zig-Zag movement to the gases which are nally emitted through openings I0 25 into the tubes 9, the central strip II of which also imparts to the gases a spiral movement. This zig-zag movement has a tendency to retard any return movement of the gases and, therefore, prevent any back pressure taking place. At the 30 same time, the impingement of the gases upon the vanes I6 and I1, 21 and 28 serve to absorb the noise vibrations and, therefore, the gases are emitted from the muflier with very Ilittle sound, in fact, no sound which is objectionable. 35

It will also be noted that the exhaust pipe, exhaust pipe enlargement, tube 4, and the pipes 9 increase in area by definite steps so that a freer flow of the discharging gases is-effected.

It may also be stated that the combined area 40 of the spaces between the vanes I6 or I1 of the disc I2 or I3 is equal in area to the area of the exhaust pipe I and the combined area of the spaces between the vanes 21 or 28 of the disc 23 or 24 is slightly greater in area to the enlarged 45 portion IX of the exhaust pipe.

From this description it will be seen that I have devised a very simple form of mufller which will absorb all noise vibrations carried in the exhaust from the engine and which will, at the 50 same time, eliminate back pressure keeping the engine cool and bringing about other essential advantages.

What I claim as my invention isz- 1. In an exhaust muffler, inner and cuter con- 55 centric tubes spaced apart, the inner tube having its outlet into the outer tube at its forward end and the outer tube having its outlet at the rear end, a stationary baffle device within the innermost tube comprising a rod extending longitudinally and centrally of the tube, individual discs mounted on the rod in spaced apart position and formed fan shaped, the blades of one disc being set in an oppositely inclined direction to the blades of the next adjacent disc and against which the exhaust entering the mufer impinges as it passes through the innermost tube directing the exhaust in opposite directions and between the blades as it passes longitudinally to the outlet, and a series of annular discs spaced apart and surrounding the innermost tube and having its annular edge slit radially and bent between the slits to form defiecting vanes and intermediate passageways between the vanes for the exhaust.

2. In an exhaust muier, an inner tube having peripheral orifices at its forward end, an outer tube concentric with the inner tube, a closure for the forward ends of the inner and outer tubes, and a stationary bale device in the inner tube comprising a rod extending longitudinally and centrally of the inner tube, individual discs mounted on the rod in spaced apart position and formed Ian shaped, the blades of one disc being set in an oppositely inclined direction to the blades of the next adjacent disc and against which the exhaust entering the Inuiller impinges as it passes through the innermost tube directing the exhaust in opposite directions and between the blades as it passes longitudinally to the outlet, and baffling means for the exhaust interposed between the inner and outer tubes and against which the exhaust also impinges as it passes to the outlet.

3. In an exhaust muiller, an inner tube having peripheral oriiices at its forward end, an outer tube concentric with the inner tube, and a closure for the forward ends of the inner and outer tubes, a stationary baille device in the inner tube, and a baille device between the inner and outer tubes comprising a series of annular discs spaced apart and surrounding the inner tube and having the outer annular edge of each disc split radially and bent between the slits to form vanes and intermediate passageways between the vanes for the exhaust.

4. In an exhaust muier, an inner tube having peripheral orices adjacent its forward end, an outer tube concentric with the inner tube and having peripheral orifices adjacent its rear end, a closure for the forward ends of the inner and outer tubes, and a tube extending forwardly from each rear peripheral orice to the forward end of the muler.

RAY BARRON. 

